OK, good luck.
Let me boil down quickly some basic response to your initial post....
When a motor is new it turns over really easy, after it has been ridden and the rings seat on the piston the compression builds and it becomes harder to turn over. So you may not have any problem at all, it might just be this increase of compression you are feeling. Make sure you have enough speed going when you pop the clutch to turn her over, going very slow with high compression sometimes wont do it.
Make sure your carb isn't leaking or letting in extra fuel into the cylinder when it is sitting, if there is liquid fuel in the cylinder during compression stroke you will have a hard time Turning her over because liquid doesn't compress.....